diff --git a/weldx/tags/time/timedeltaindex.py b/weldx/tags/time/timedeltaindex.py
index 296da28ab..72b2467f6 100644
--- a/weldx/tags/time/timedeltaindex.py
+++ b/weldx/tags/time/timedeltaindex.py
@@ -13,7 +13,6 @@
 
 def _handle_converted_pd_tdi_units(node: TaggedDict):
     """Convert changed units in Pandas.Datetimeindex to valid values."""
-    # todo: would it be safer to use a regex here to avoid ambiguity with modern units?
     unit = node["freq"][-1]
     if unit in PANDAS_OLD_UNIT_SUFFIXES.keys():
         node["freq"] = node["freq"][:-1] + PANDAS_OLD_UNIT_SUFFIXES[unit]